How to see network traffic on gmod server DDOS help

Hello recently today my server has been experiencing ddos attacks and I want to know is there a way to monitor network traffic for example monitor if someone is sending a packet to the server and vise versa. I have contacted my server host to make sure it not a problem on there end and the can confirm that there server are all up a running fine.

If this is a VPS or dedicated server then yes you can monitor the traffic hitting it through SSH or ipmi/console. For a shared game server you would have to ask your provider to monitor it for you.

To see traffic if he hosting from his house he can see it in his modem logs they show dos attacks.